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Testing the Coil 900 1991

posted by lucid on Mon Mar 14 08:55 CST 2011
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last visit: Fri Oct 24 12:31 CST 2014

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"I will be looking at the coil this afternoon. What's the best way to test it?"

• Use a 12V test light on the Blue wire terminal, with the Key On. Use a meter if you don't have a test light.

If there is 12V at the blue wire, test for it at the Red-White wire too. With the Ignition CU and amplifier inactive, it should read thru the primary coil.

If no 12V at the Blue wire, suspect the RSR. It may be new, but failing due to a bad ground connection (happened to me). The pic below shows the ground tabs look like on a non-turbo, behind the right headlight. Yours will be on the left side.

If it was mine, I would unplug the RSR wires (Key OFF) and install a temporary jumper wire to connect the 2 thicker Red and Green wires. Then see if it starts (or at least tries). On a turbo car, the RSR controls both coil voltage AND injector voltage.

Remove ground tab to clean body metal contact area too (10mm hex bolt)

--
Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.

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Died on Hgwy & won't start [900][1991]
posted by Sarki on Mon Mar 7 21:15 CST 2011 >

Died on Hgwy & won't start [900][1991]
posted by GT144 on Mon Mar 7 21:58 CST 2011 > V

Died on Hgwy & won't start [900][1991]
posted by jerryc on Tue Mar 8 02:02 CST 2011 > V
- Died on Hgwy & won't start [900][1991]
  posted by Sarki on Tue Mar 8 07:06 CST 2011 > V
  - Died on Hgwy & won't start [900][1991]
    posted by mmal231294 on Tue Mar 8 08:14 CST 2011 > V
    - Died on Hgwy & won't start [900][1991]
      posted by Sarki on Tue Mar 8 09:28 CST 2011 > V
      - Died on Hgwy & won't start [900][1991]
        posted by jerryc on Tue Mar 8 09:46 CST 2011 > V
        
        Died on Hgwy & won't start [900][1991]
        posted by Sarki on Tue Mar 8 09:58 CST 2011 > V
        
        Died on Hgwy & won't start [900][1991]
        posted by TONY H subscriber on Tue Mar 8 11:40 CST 2011 > V
        
        Died on Hgwy & won't start [900][1991]
        posted by ridesR100RS on Tue Mar 8 12:24 CST 2011 > V
        
        Died on Hgwy & won't start [900][1991]
        posted by Sarki on Tue Mar 8 12:55 CST 2011 > V
        
        Died on Hgwy & won't start [900][1991]
        posted by Goatman on Tue Mar 8 17:52 CST 2011 > V
        
        Died on Hgwy & won't start [900][1991]
        posted by mmal231294 on Tue Mar 8 12:11 CST 2011 > V
        
        Died on Hgwy & won't start [900][1991]
        posted by Sarki on Tue Mar 8 10:00 CST 2011 > V

Died on Hgwy & won't start [900][1991]
posted by Sarki on Wed Mar 9 22:03 CST 2011 > V
- Died on Hgwy & won't start [900][1991]
  posted by Onkel Udo II subscriber on Thu Mar 10 05:41 CST 2011 > V
- Died on Hgwy & won't start [900][1991]
  posted by mmal231294 on Thu Mar 10 08:51 CST 2011 > V

Died on Hgwy & won't start [900][1991]
posted by Sarki on Sun Mar 13 19:03 CST 2011 > V
- Died on Hgwy & won't start [900][1991]
  posted by spook on Sun Mar 13 21:31 CST 2011 > V
  - Died on Hgwy & won't start [900][1991]
    posted by jerryc on Sun Mar 13 21:57 CST 2011 > V
    - Died on Hgwy & won't start [900][1991]
      posted by Sarki on Mon Mar 14 06:25 CST 2011 > V
      - Died on Hgwy & won't start [900][1991]
        posted by mmal231294 on Mon Mar 14 07:53 CST 2011 > V
      - Testing the Coil [900][1991]
        posted by lucid subscriber on Mon Mar 14 08:55 CST 2011 > V
        
        Testing the Coil [900][1991]
        posted by Sarki on Mon Mar 14 09:25 CST 2011 > V
        
        Testing the Coil [900][1991]
        posted by 1fatcat on Mon Mar 14 10:12 CST 2011 > V
        
        Testing the Coil [900][1991]
        posted by Sarki on Mon Mar 14 10:49 CST 2011 > V
        
        RSR bypass jumper [900][1991]
        posted by lucid subscriber on Mon Mar 14 12:52 CST 2011 > V
        
        RSR bypass jumper [900][1991]
        posted by Sarki on Mon Mar 14 13:51 CST 2011 > V
        
        RSR bypass jumper [900][1991]
        posted by lucid subscriber on Mon Mar 14 14:59 CST 2011 > V
        
        RSR bypass jumper [900][1991]
        posted by Will740turbo subscriber on Mon Mar 14 15:23 CST 2011 > V
        
        RSR bypass jumper [900][1991]
        posted by Sarki on Mon Mar 14 15:53 CST 2011 > V
        
        RSR bypass jumper [900][1991]
        posted by lucid subscriber on Mon Mar 14 17:11 CST 2011 > V
        
        RSR bypass jumper [900][1991]
        posted by Sarki on Mon Mar 14 17:30 CST 2011 > V
        
        RSR bypass jumper [900][1991]
        posted by jerryc on Mon Mar 14 23:10 CST 2011 > V

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Testing the Coil 900 1991